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#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;

int isprime(int n)
{
  if (n &lt;= 1)
    return 0;

  for (int i = 2; i &lt;= n / 2; i++)
    if (n % i == 0)
      return 0;

  return 1;
}

int main(int argc, char *argv[])
{
  int n = 7;

  printf(&quot;%d is %s prime\n&quot;, n, isprime(n) ? &quot;a&quot; : &quot;not a&quot;);

  return 0;
}
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